CN117577427A - Miniature inductor and manufacturing method thereof - Google Patents
Miniature inductor and manufacturing method thereof Download PDFInfo
- Publication number
- CN117577427A CN117577427A CN202311662132.6A CN202311662132A CN117577427A CN 117577427 A CN117577427 A CN 117577427A CN 202311662132 A CN202311662132 A CN 202311662132A CN 117577427 A CN117577427 A CN 117577427A
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- China
- Prior art keywords
- magnetic core
- resin
- conductor
- micro
- manufacturing
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- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000004020 conductor Substances 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000006247 magnetic powder Substances 0.000 claims abstract description 14
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims description 42
- 229920005989 resin Polymers 0.000 claims description 42
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000011810 insulating material Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 102220328583 rs111822347 Human genes 0.000 claims description 6
- 238000009713 electroplating Methods 0.000 claims description 4
- 102220521910 THAP domain-containing protein 1_S21C_mutation Human genes 0.000 claims description 3
- 102200084388 rs121918345 Human genes 0.000 claims description 3
- 102220247850 rs1421233354 Human genes 0.000 claims description 3
- 102220070930 rs794728599 Human genes 0.000 claims description 3
- 238000004804 winding Methods 0.000 abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/255—Magnetic cores made from particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The invention relates to a miniature inductor and a manufacturing method thereof, wherein the miniature inductor comprises a magnetic core, a conductor positioned in the magnetic core and an electrode positioned on the surface of the magnetic core; the conductor is electrically connected with the electrode; the magnetic core is formed by pressing magnetic powder; the magnetic core is provided with a reserved passage; the conductor is directly formed in the reserved channel. By directly forming the conductor inside the pressed magnetic core, the winding process is omitted, and the problem that the copper wire is broken in the winding process can be avoided; the conductor is formed after the pressing forming process, and can not be subjected to larger pressure, so that the conductor can be prevented from being broken in the pressing process.
Description
Technical Field
The present disclosure relates to electronic devices, and particularly to a micro-inductor and a method for manufacturing the micro-inductor.
Background
The inductor is one of three passive electronic components, including a magnetic core, a coil and an electrode, and is widely applied to various electronic circuits. The coil of the inductor is usually formed by winding copper wires, and after the winding of the coil is completed, the coil is put into soft magnetic powder for compression molding or sintered molding to form the inductor. The micro-inductor has smaller volume, is generally used in specific application fields, and plays a role of filtering. Because the miniature inductor is small in size, the coil can only be wound by copper wires with small wire diameters, and the copper wires are easy to break in the winding process and the pressing process.
Disclosure of Invention
The invention provides a miniature inductor and a manufacturing method thereof, wherein a channel is reserved in a magnetic core, and a conductor is directly formed in the channel, so that stress stretch-breaking in the copper wire winding process or pressure break in the pressing process can be avoided.
The invention provides a miniature inductor, which comprises a magnetic core, a conductor positioned in the magnetic core and an electrode positioned on the surface of the magnetic core; the conductor is electrically connected with the electrode; the magnetic core is formed by pressing magnetic powder; the magnetic core is provided with a reserved passage; the conductor is directly formed in the reserved channel.
Further is: an insulating layer is arranged in the reserved passage, and the conductor is formed in the reserved passage through electroplating.
Further is: the reserved channel is spiral.
The invention also provides a manufacturing method of the miniature inductor, which comprises the following steps:
s1: preparing a magnetic core by using magnetic powder, and forming a reserved channel inside the magnetic core;
s2: forming a continuous conductor in the reserved channel;
s3: an electrode electrically connected to the conductor is formed on the surface of the magnetic core.
Further is: the step S1 further includes the steps of: s11: placing the spiral resin into a mold cavity of a mold, filling magnetic powder into the mold cavity of the mold, and compacting to obtain a semi-finished magnetic core; s12: and (3) heating the semi-finished magnetic core obtained in the step S11 to enable the resin to flow out after melting, so as to obtain the magnetic core with the spiral reserved channel.
Further is: the step S2 further includes the steps of: S21A: sequentially coating an insulating material and a conductive material in the spiral reserved channel to obtain an insulating layer and a conductive layer; S22A: a continuous electrical conductor is electroplated onto the conductive layer.
Further is: the spiral resin comprises an outer layer resin and an inner layer resin; the melting point of the outer layer resin is higher than that of the inner layer resin; the step S12 is to melt the inner resin and flow out the resin, and the outer resin is left in the magnetic core when heated.
Further is: the step S2 further includes the steps of: S21B: coating a conductive material on the inner surface of the outer spiral resin to form a conductive layer; S22B: a continuous electrical conductor is electroplated onto the conductive layer.
Further is: the step S1 further includes the steps of: S11C: placing straight resin into a mold cavity of a mold, filling magnetic powder into the mold cavity of the mold, and compacting to obtain a semi-finished magnetic core; S12C: and (3) heating the semi-finished magnetic core obtained in the step S11C to enable the resin to flow out after being melted, so as to obtain the magnetic core with the straight reserved channel.
Further is: the step S2 further includes the steps of: S21C: filling metal powder into the reserved channel, and compacting the metal powder to form a continuous conductor.
The beneficial effects of the invention are as follows: by directly forming the conductor inside the pressed magnetic core, the winding process is omitted, and the problem that the copper wire is broken in the winding process can be avoided; the conductor is formed after the pressing forming process, and can not be subjected to larger pressure, so that the conductor can be prevented from being broken in the pressing process.
Drawings
FIG. 1 is a schematic diagram of a micro-inductor structure;
FIG. 2 is a schematic flow chart of a method for manufacturing a micro-inductor;
FIG. 3 is a schematic flow chart of a method for manufacturing a micro-inductor;
FIG. 4 is a schematic diagram of a cross-sectional structure of an electrical conductor;
FIG. 5 is an enlarged schematic view of a cross-section of a conductor in accordance with one embodiment;
FIG. 6 is an enlarged schematic view of a portion of a spiral resin section in accordance with the first embodiment;
FIG. 7 is an enlarged schematic view of a cross-section of a conductor in a second embodiment;
FIG. 8 is a flow chart illustrating the manufacturing method of three micro-inductors according to the embodiment;
marked in the figure as: 100. spiral resin; 101. an outer layer resin; 102. an inner layer resin; 110. reserving a channel; 110C, reserving a channel; 111. an insulating layer; 120. an electric conductor; 120C, an electrical conductor; 130. an electrode; 200. a magnetic core.
Detailed Description
For the purpose of promoting an understanding of the invention, reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application.
The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "plurality" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1 to 3, the present application provides a micro-inductor, which includes a magnetic core 200, a conductor 120 located in the magnetic core 200, and an electrode 130 located on a surface of the magnetic core 200; the conductor 120 is electrically connected with the electrode 130; the magnetic core 200 is formed by pressing magnetic powder; the magnetic core 200 has a reserved passage 110; the conductor 120 is directly formed in the reserve channel 110.
On the basis of the above, the insulating layer 111 is disposed in the reserved passage 110, and the conductor 120 is formed in the reserved passage 110 by electroplating.
On the basis of the above, the reserved channel 110 in this embodiment is spiral; the cross section of the reserved passage 110 is circular, elliptical or square. In other embodiments, the reserved tunnel 110 may be a tunnel with straight sections
The application further provides a method for manufacturing the micro-inductor, please refer to fig. 2 and 3, specifically comprising the following steps:
s1: preparing a magnetic core 200 using magnetic powder, and forming a reserved passage 110 inside the magnetic core 200;
s2: forming a continuous electrical conductor 120 within the pre-tunnel 110;
s3: an electrode 130 electrically connected to the conductor 120 is formed on the surface of the core 200.
On the basis of the above, as shown in fig. 3, the step S1 further includes the following steps: s11: placing the spiral resin 100 into a mold cavity of a mold, filling magnetic powder into the mold cavity of the mold, and compacting to obtain a semi-finished magnetic core; s12: the semi-finished core obtained in step S11 is heated so that the spiral resin 100 flows out after melting, resulting in the core 200 having the spiral-shaped pre-formed channels 110.
On the basis of the above, referring to fig. 3 to 5, the step S2 further includes the following steps: S21A: sequentially coating an insulating material and a conductive material in the spiral reserved channel 110 to obtain an insulating layer 111 and a conductive layer; S22A: a continuous electrical conductor 120 is electroplated onto the conductive layer. In actual production, the insulating material can be poured into the reserved channel 110, then the flexible material is used to extend into the reserved channel 110, so that the insulating material is uniformly coated on the inner wall of the reserved channel 110, and finally the insulating layer can be obtained by heating to solidify the insulating material. The conductive layer may be formed on the insulating layer by similar means, and the conductive material used in this embodiment is graphite conductive paint.
On the basis of the above, the magnetic core 200 having the insulating layer and the conductive layer is put into a separate solution, and the continuous conductor 120 is formed by electroplating on the conductive layer of the preliminary passage 110.
Example two
Referring to fig. 6 and 7, the difference between the present embodiment and the first embodiment is that: the spiral resin 100 in the present embodiment includes an outer layer resin 101 and an inner layer resin 102; the melting point of the outer layer resin 101 is higher than that of the inner layer resin 102; in the step S12, when the inner resin 102 melts and flows out during heating, the outer resin 101 remains in the magnetic core 200 as an insulating layer, and the process of coating the insulating material into the reserved passage 110 can be omitted, thereby improving the production efficiency.
On the basis of the above, the step S2 in the present embodiment further includes the steps of: S21B: coating a conductive material on the inner surface of the outer resin 101 to form a conductive layer; S22B: a continuous electrical conductor 120 is electroplated onto the conductive layer.
Example III
The difference between the present embodiment and the first embodiment is that the shape of the reserved passage 110 in the magnetic core 200 is different, please refer to fig. 8, specifically, the present embodiment includes the following steps: S11C: placing straight resin into a mold cavity of a mold, filling magnetic powder into the mold cavity of the mold, and compacting to obtain a semi-finished magnetic core; S12C: heating the semi-finished magnetic core obtained in the step S11C to enable the resin to flow out after being melted, so as to obtain a magnetic core 200 with a straight reserved channel; S21C: filling the pre-formed channels 110 with metal powder with higher conductivity, such as one or more of copper, silver and aluminum, and compacting the metal powder to form a continuous conductor 120; S3C: an electrode 130 electrically connected to the conductor 120 is formed on the surface of the core 200.
The foregoing description is only illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the present application, but is not intended to limit the scope of the present application.
Claims (10)
1. A miniature inductor comprises a magnetic core, an electric conductor positioned in the magnetic core and an electrode positioned on the surface of the magnetic core; the conductor is electrically connected with the electrode; the method is characterized in that: the magnetic core is formed by pressing magnetic powder; the magnetic core is provided with a reserved passage; the conductor is directly formed in the reserved channel.
2. A micro-inductor according to claim 1, characterized in that: an insulating layer is arranged in the reserved passage, and the conductor is formed in the reserved passage through electroplating.
3. A micro-inductor according to claim 1, characterized in that: the reserved channel is spiral.
4. A method for manufacturing a miniature inductor, which is characterized in that: the method comprises the following steps:
s1: preparing a magnetic core by using magnetic powder, and forming a reserved channel inside the magnetic core;
s2: forming a continuous conductor in the reserved channel;
s3: an electrode electrically connected to the conductor is formed on the surface of the magnetic core.
5. The method of manufacturing a micro-inductor according to claim 4, wherein: the step S1 further includes the steps of: s11: placing the spiral resin into a mold cavity of a mold, filling magnetic powder into the mold cavity of the mold, and compacting to obtain a semi-finished magnetic core; s12: and (3) heating the semi-finished magnetic core obtained in the step S11 to enable the resin to flow out after melting, so as to obtain the magnetic core with the spiral reserved channel.
6. The method of manufacturing a micro-inductor according to claim 5, wherein: the step S2 further includes the steps of: S21A: sequentially coating an insulating material and a conductive material in the spiral reserved channel to obtain an insulating layer and a conductive layer; S22A: a continuous electrical conductor is electroplated onto the conductive layer.
7. The method of manufacturing a micro-inductor according to claim 5, wherein: the spiral resin comprises an outer layer resin and an inner layer resin; the melting point of the outer layer resin is higher than that of the inner layer resin; the step S12 is to melt the inner resin and flow out the resin, and the outer resin is left in the magnetic core when heated.
8. The method of manufacturing a micro-inductor according to claim 7, wherein: the step S2 further includes the steps of: S21B: coating a conductive material on the inner surface of the outer spiral resin to form a conductive layer; S22B: a continuous electrical conductor is electroplated onto the conductive layer.
9. The method of manufacturing a micro-inductor according to claim 4, wherein: the step S1 further includes the steps of: S11C: placing straight resin into a mold cavity of a mold, filling magnetic powder into the mold cavity of the mold, and compacting to obtain a semi-finished magnetic core; S12C: and (3) heating the semi-finished magnetic core obtained in the step S11C to enable the resin to flow out after being melted, so as to obtain the magnetic core with the straight reserved channel.
10. The method for manufacturing a micro-inductor according to claim 9, wherein: the step S2 further includes the steps of: S21C: filling metal powder into the reserved channel, and compacting the metal powder to form a continuous conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311662132.6A CN117577427A (en) | 2023-12-06 | 2023-12-06 | Miniature inductor and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311662132.6A CN117577427A (en) | 2023-12-06 | 2023-12-06 | Miniature inductor and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117577427A true CN117577427A (en) | 2024-02-20 |
Family
ID=89862350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311662132.6A Pending CN117577427A (en) | 2023-12-06 | 2023-12-06 | Miniature inductor and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117577427A (en) |
-
2023
- 2023-12-06 CN CN202311662132.6A patent/CN117577427A/en active Pending
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